CBSE Class 12 Computer Science File Handling Worksheet Set 01

Class 12 Computer Science Practice Set: File Handling

Access printable practice worksheets for File Handling designed to align with the 2026-27 academic syllabus for Class 12 Computer Science. These structured exercises help students evaluate their conceptual understanding and improve exam readiness.

Download File Handling Worksheet PDF

View or download the dedicated File Handling practice resource below. Engaging with these objective and subjective questions daily ensures continuous academic progress and mastery of the 2026-27 curriculum.

1. Data File Data files are the files that store and preserve data released to a particular application.
Computers store every file as a collection of 0s and 1s, i.e. in binary form. Therefore, every file is basically just a series of bytes stored.

2. Text File It is a sequence of characters consisting of alphabets, numbers and other special symbols.
It stores information in ASCII characters. In text file, each line of text is terminated with a special character known as EOL (End of Line) or delimiter.

The file extension of text file is .txt.

(i) Opening a File In file handling, the first requirement is opening a file. Once a file is opened, read, write, append, close, etc., can be performed on the file. To open a file, open() method is used in Python.

(ii) Closing a File It is important to close files as soon as you have finished your work with file.
Opened file is closed by calling the close() method of its file objects.

(iii) Writing into Files For writing to a file, we first need to open it in write or append mode. In Python, there are two methods of file objects which are used to write data into a files.

• write() This method takes a string and writes it into the file. This method does not add a newline character (‘\n’) to the end of the string.
Syntax <FileHandle>.write(str1)

• writelines () Whenever, we have to write a sequence of string to a file, we will use writelines() instead of write().
Syntax <FileHandle>.writelines(L)

(iv) Reading from Files After writing information into a file, you must need to read that data at some point. Python provides mainly four types of read methods to read data from file.
• read() This method returns a string containing all characters in a file.
Syntax <FileHandle>.read()

• read([size]) This method specifies how many characters the string should return.
Syntax <FileHandle>.read(n)

• readline() This method will read from a file line by line. For readline(), a line is terminated by ‘\n’ or End of Line (EOL) (i.e. new line character). When end of file is reached, readline() will return an empty string.
Syntax <FileHandle>.readline()

• readlines() This method will return a list of strings, each separated by ‘\n’.
This method reads all rows and retains the newlines character that is at the end of every row.
Syntax <FileHandle>.readlines()

(v) flush() Method This method will force out any unsaved data that exists in a program buffer to the actual file.
Python automatically flushes the files when closing them. But you may want to flush the data before closing any file.
Syntax FileObject.flush()

(vi) Random Access Methods Python provides two methods to perform random access operations in a file. These methods help you to manipulate the position of file pointer and thus you can read and write from desired position in the file.

• tell() Method This method tells you the current position within the file, measured in bytes from the beginning of the file.
Syntax File0bject.tell()

•seek() Method This method can be used to change the current position in a file. This method does not return any value.
Syntax File0bject.seek(offset[,mode])

3. Binary File It is a file that contains information in the same format as it is held in memory. In binary files, no delimiters are used for a line and no translations occur here. They represent the actual content such as image, audio, video, executable files, etc. These files are not human readable. The file extension of binary file is .dat.

(i) Working with Binary File Python object handles the binary files. Python provides a special module-the pickle module which can be used to store any kind of object in file.

(ii) Using dump( ) Method This method is used to write objects to a file. Before use the dump( ) method, you first have to import the pickle module.
Syntax
import pickle
......
......
......
pickle.dump(object_to_pickle,File0bject)

(iii) Using load() Method
This method is used to load data from a binary file.
Syntax
import pickle
......
......
......
object=pickle.load(File0bject)

4. CSV File CSV (Comma Separated Values) format is one of the most simple and common ways to store data in tabular form. Each record consists of one or more fields separated by commas. To represent a CSV file, it must be saved with the .csv file extension.

(i) Working with csv file csv files are used to store a large number of variables or data. They are
incredibly simplified spreadsheets. Each line in a csv file is a data record.

(ii) Read from CSV File Using csv.reader() To read data from csv files, you must use the reader() function to generate a reader object.
This function returns a reader object which is an iterator of lines in the csv file.
Syntax csv.reader(<FileHandle>)

(iii) Write into a CSV File Using csv.writerow() To write an existing file, you must first open the file in one of writing modes (w, a or r+) first. For this, writerow() function is used in Python for csv files.
This function writes items in a sequence (list, tuple or string) separating them by comma character.

 

Direction (Q. Nos. 1-15) Each of the question has four options out of which only one is correct.

Select the correct option as your answer.

1. To read three characters from a file object f, we use ……… .
(a) f.read(3)
(b) f.read()
(c) f.readline()
(d) f.readlines()
Answer : A

2. How do you get the current position within the file?
(a) fp.seek()
(b) fp.tell()
(c) fp.loc()
(d) fp.pos()
Answer : B

3. The files that consists of human readable characters
(a) binary file
(b) text file
(c) Both (a) and (b)
(d) None of these
Answer : B

4. Which function is used to write a list of string in a file?
(a) writeline()
(b) writelines()
(c) writestatement()
(d) writefullline()
Answer : A

5. What will be the output of the following Python code?
myFile = None
for i in range (8):
with open(“data.txt”, “w”) as myFile:
if i > 5:
break
print(myFile.closed)
(a) True
(b) False
(c) None
(d) Error
Answer : A

6. What is the use of seek() method in files?
(a) Sets the file’s current position at the offset
(b) Sets the file’s previous position at the offset
(c) Sets the file’s current position within the file
(d) None of the mentioned
Answer : A

7. What will be the output of the following Python code?
myFile = open(“story.txt”, “wb”)
print(“ Name of the file: ”, myFile.name)
myFile.flush()
myFile.close()
(a) Compilation error
(b) Runtime error
(c) No output
(d) Flushes the file when closing them
Answer : D

Suppose the content of the file ‘‘story.txt’’ is
Education Hub
Learning is the key of success.

8. What is the output of following code?
myfile=open(‘story.txt’,‘r’)
s=myfile.read(10)
print(s)
s1=myfile.read(15)
print(s1)
myfile.close()
(a) Education
Hub Learning is
(b) Education
Hub
Learning is
(c) Education 
Hub
Learning
is
(d) Education Hub
Learning is
Answer : B

9. What is the output of following code?
f=open(‘story.txt’, ‘r’)
s=f.readline()
lcount=len(s)
print(lcount)
f.close( )
(a) 4
(b) 2
(c) 1
(d) 8
Answer : B

10. What is the output of following code?
f=open(‘story.txt’, ‘r’)
str=“ ”
s=0
ts=0
while str:
     str=f.readline()
     ts=ts+len(str)
print(ts)
f.close()
(a) 44
(b) 43
(c) 37
(d) 45
Answer : A

11. What is the output of following code?
def test () :
s=open (“story.txt”, “r”)
f=s.read()
z=f.split( )
count=0
for i in z:
     count=count+1
print(count)
(a) 7
(b) 8
(c) 5
(d) 9
Answer : B

Suppose the content of file ‘‘Para.txt’’ is
Education Hub
Electronic learning
Learning is the key of success

12. What is the output of following code?
def test() :
f=open (“Para.txt”, “r”)
lines=0
l=f.readlines( )
for i in l:
     if i [0] = = ‘E’ :
          lines+=1
print(lines)
(a) 2
(b) 1
(c) 3
(d) Error
Answer : A

13. What is the output of following code?
def myFunc() :
f=open (“Para.txt”, “r”)
count=0
x=f.read()
word=x.split()
for i in word:
     if (i!=“learning”):
          count=count+1
     print(count)
myFunc()
(a) 2
(b) 10
(c) 8
(d) Error
Answer : C

14. What is the output of following code?
def test():
f=open(“Para.TXT”)
n1=0
n2=0
while True:
     l=f.readline()
     if not l:
          break
     for i in l:
          if (i==‘E’ or i==‘e’):
               n1=n1+1
          elif(i==‘C’ or i==‘c’) :
               n2=n2+1
print(n1)
print(n2)
f.close()
(a) 8
     5
(b) 8
      4
(c) 3
     7
(d) Error
Answer : A

15. What is the output of following code?
def Func():
     with open(‘Para.txt’, ‘r’) as f :
          l=f.readlines()
f.close( )
print(l)
del l[3]
print (l)
f=open (‘Para.txt’, ‘w’)
f.writelines(l)
f.close( )
(a) Delete the 3rd word from file
(b) Delete the 4th word from file
(c) Delete the 3rd word from file at end
(d) Error
Answer : B

 
 
1. To open a file c:\scores.txt for reading, we use
a) Infile = open(“c:\scores.txt”, “r”)
b) infile = open(“c:\\scores.txt”, “r”)
c) infile = open(file = “c:\scores.txt”, “r”)
d) infile = open(file = “c:\\scores.txt”, “r”)
 
2. To open a file c:\scores.txt for writing, we use
a) outfile = open(“c:\scores.txt”, “w”)
b) outfile = open(“c:\\scores.txt”, “w”)
c) outfile = open(file = “c:\scores.txt”, “w”)
d) outfile = open(file = “c:\\scores.txt”, “w”)
 
3. What is a file? What are the two basic operations which are performed on a file?
 
4. What is the difference between a text file and a binary file?
 
5. Differentiate between ‘write’ mode and ‘append’ mode.
 
6. What different functions are available to write data in a text file?Describe each in brief.
 
7. What different functions are available to read data from a text file? Describe each in brief.
 
8. Why is it important to close a file?
 
9. In which mode should a file be opened:
a) To write data into an existing file.
b) To read data from a file
c) To create a new file and write data into it.
d) To write data into an existing file. If the file does not exist, then file should be created to write data into it.
 
10. Differentiate between seek() and tell().
 
11. Which functions are used to (i) rename a file, (ii) delete a file? In which module are these functions available?
 
12. What are the three standard input-output streams in Python?
 
13. Define the terms ‘pickling’ and ‘unpickling’.
 
14. What are different file opening modes for a text file in Python? Write,in brief, what does each mode do?
 
15. Consider the following code:
ch = "A"
f=open("data.txt",'a')
f.write(ch)
print(f.tell())
f.close()
What is the output if the file content before the execution of the program is the string "ABC"? (Note that" " are not the part of the string)
 
16. Write a single statement to display the contents of a text file named "abc.txt"
 
17. Assuming that a text file named TEXT1.TXT already contains some text written into it, write a function named vowelwords(), that reads the file TEXT1.TXT and creates a new file named TEXT2.TXT,
which shall contain only those words from the file TEXT1.TXT which
don’t start with an uppercase vowel (i.e., with ‘A’, ‘E’, ‘I’, ‘O’, ‘U’).
For example, if the file TEXT1.TXT contains
Carry Umbrella and Overcoat When It rains
Then the text file TEXT2.TXT shall contain Carry and When rains
 
18. Write a function in PYTHON to count and display the number of
words starting with alphabet ‘A’ or ‘a’ present in a text file
“LINES.TXT”. Example:
If the file “LINES.TXT” contains the following lines,
A boy is playing there. There is a playground.
An aeroplane is in the sky.
Are you getting it?
The function should display the output as 5.
 
19. Write a function show(n) that will display the nth character from the existing file “MIRA.TXT”. If the total characters present are less thann, then it should display “invalid n”.
 
20. Write a function CountHisHer() in PYTHON which reads the contents of a text file “Gender.txt” which counts the words His and Her (not case sensitive) present in the file.
For, example, if the file contains:
Pankaj has gone to his friend’s house. His friend’s name is Ravya. Her house is 12KM from here.
The function should display the output:
Count of His: 2
Count of Her: 1
 
21 Write the function definition for WORD4CHAR() in PYTHON to read the content of a text file FUN.TXT, and display all those words, which have four characters in it.
Example:
If the content of the file Fun.TXT is as follows:
When I was a small child, I used to play in the garden with my grand mom. Those days were amazingly fun filled and I remember all the moments of that time
The function WORD4CHAR() should display the following:
When used play with days were that time

 

Please click on below link to download CBSE Class 12 Computer Science File Handling Worksheet Set A

Free study material for Computer Science

Download CBSE Practice Material: Class 12 Computer Science File Handling

File Handling Printable Worksheet for Class 12 Computer Science

Explore reliable practice questions for File Handling tailored for Class 12 Computer Science learners. Use these structured worksheets to evaluate preparedness and strengthen problem-solving skills.

How to Use These Practice Sheets

Cross-reference your completed exercises with comprehensive NCERT solutions for Class 12 Computer Science to ensure absolute clarity across all sub-topics in this chapter.

Enhance Speed with Online Practice

Explore our broader library of printable assignments, chapter notes, and mock tests designed to support continuous revision and secure higher marks in CBSE assessments.

FAQs

Where can I download the latest PDF for CBSE Class 12 Computer Science File Handling Worksheet Set 01?

You can download the teacher-verified PDF for CBSE Class 12 Computer Science File Handling Worksheet Set 01 from StudiesToday.com. These practice sheets for Class 12 Computer Science are designed as per the latest CBSE academic session.

Are these Computer Science Class 12 worksheets based on the 2026-27 competency-based pattern?

Yes, our CBSE Class 12 Computer Science File Handling Worksheet Set 01 includes a variety of questions like Case-based studies, Assertion-Reasoning, and MCQs as per the 50% competency-based weightage in the latest curriculum for Class 12.

Do you provide solved answers for CBSE Class 12 Computer Science File Handling Worksheet Set 01?

Yes, we have provided detailed solutions for CBSE Class 12 Computer Science File Handling Worksheet Set 01 to help Class 12 and follow the official CBSE marking scheme.

How does solving CBSE Class 12 Computer Science File Handling Worksheet Set 01 help in exam preparation?

Daily practice with these Computer Science worksheets helps in identifying understanding gaps. It also improves question solving speed and ensures that Class 12 students get more marks in CBSE exams.

Is there any charge for the Class 12 Computer Science practice test papers?

All our Class 12 Computer Science practice test papers and worksheets are available for free download in mobile-friendly PDF format. You can access CBSE Class 12 Computer Science File Handling Worksheet Set 01 without any registration.